Using open events to expand/collapse tree nodes or to open the
current selection is very common in the Eclipse workbench. An
IOpenListener has been attached to the 'Repositories' view so
that it will react in the same way as other Eclipse views.
Change-Id: I2e6d622fc96ca4a0f52ac0b462f1320f754dbc1b
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>